{
  "cveId": "CVE-2026-64417",
  "url": "https://patchblox.com/security/cve/CVE-2026-64417",
  "summary": "CVE-2026-64417 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64417, released July 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm: shrinker: fix NULL pointer dereference in de...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm: shrinker: fix NULL pointer dereference in debugfs  shrinker_debugfs_add() creates both \u0022count\u0022 and \u0022scan\u0022 debugfs files unconditionally.  That assumes every shrinker implements both count_objects() and scan_objects(), which is not guaranteed.  For example, the xen-backend shrinker sets count_objects() but leaves scan_objects() NULL, so writing to its scan file calls through a NULL function pointer and panics the kernel:  BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. Call Trace:  \u003CTASK\u003E  shrinker_debugfs_scan_write\u002B0x12e/0x270  full_proxy_write\u002B0x5f/0x90  vfs_write\u002B0xde/0x420  ? filp_flush\u002B0x75/0x90  ? filp_close\u002B0x1d/0x30  ? do_dup2\u002B0xb8/0x120  ksys_write\u002B0x68/0xf0  ? filp_flush\u002B0x75/0x90  do_syscall_64\u002B0xb3/0x5b0  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e  The count path has the same issue in principle if a shrinker omits count_objects().  To fix it, only create \u0022count\u0022 and \u0022scan\u0022 debugfs files when the corresponding callbacks are present.",
  "published": "2026-07-25T10:17:25Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00123,
  "epssPercentile": 0.02052,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.180-1",
      "fix": "DEBIAN-CVE-2026-64417",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64417",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.96-1",
      "fix": "DEBIAN-CVE-2026-64417",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64417",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.4-1",
      "fix": "DEBIAN-CVE-2026-64417",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64417",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.100-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-64417",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64417",
      "released": "2026-07-26T13:52:50Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}